Quicksilver Messenger Service and Big Brother & the Holding Company
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Notes
Corry now doubts: "it seems extremely unlikely that the bands would repeat the booking just nine days later, even if it was Halloween. Is there any evidence other than the poster that the 1967 Halloween concert actually took place?"
The set list and circulating music that has been associated with this date was actually a fake taken from the November Shrine shows. The real set list is unknown, except for Viola Lee. One eyewitness recalls that "Viola Lee was a monster", which may confirm it in the setlist (Per Deadessays.com blog). I have reassociated that music with 11/10/67.